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Thunderbird suddenly stopped sending from OUTLOOK

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Thunderbird has worked flawlessly for my Outlook account as well as several IMAP accounts now for the last 2 days, it refuses to send. CY4PEPF0000EE36.mail.protection.outlook.com gave this error: Requested action not taken: mailbox unavailable (S2017062302).

Refuses to send ONLY from Outlook.

Thunderbird has worked flawlessly for my Outlook account as well as several IMAP accounts now for the last 2 days, it refuses to send. CY4PEPF0000EE36.mail.protection.outlook.com gave this error: Requested action not taken: mailbox unavailable (S2017062302). Refuses to send ONLY from Outlook.
Attached screenshots

Modified by billieraven

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